diff --git a/app/Jobs/ScheduleNextMaintenance.php b/app/Jobs/ScheduleNextMaintenance.php
index 944cd6a..b3e884f 100644
--- a/app/Jobs/ScheduleNextMaintenance.php
+++ b/app/Jobs/ScheduleNextMaintenance.php
@@ -30,9 +30,17 @@ class ScheduleNextMaintenance implements ShouldQueue
     {
         $maintenances = Maintenance::all();
         foreach ($maintenances as $maintenance) {
-            $cron = new CronExpression($maintenance->schedule);
-            dump($cron->getNextRunDate(null, 2)->format('Y-m-d H:i:s'));
+            $valid = CronExpression::isValidExpression($maintenance->schedule);
+            if (!$valid) {
+                dd($maintenance->schedule);
+                return;
+            }
 
+            $cron = new CronExpression($maintenance->schedule);
+            if (!$cron->isDue('now')) {
+                dd($cron->getNextRunDate());
+                return;
+            }
 
             $maintenance->history()->create([
                 'start_at' => $cron->getNextRunDate(null, 2)